Sothink SWF Decompiler successfully decompiles the SWFs located inside the ORB into recognizable texts! I have requested them to add a feature like "Export as PDF". That could have been an excellent solution... We'd get a searchable PDF (i.e. a real text-image PDF format), not just an Image-only PDF (as obtained by image-conversion techniques, OCR recognition is always imperfect)...
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I followed the steps above but the Kurst SWF Renderer won't convert the SWF into PNG one by one. Instead it converts the first SWF filw into multiple PNG (1560 times to be exact, which is the number of pages in the book), then starts converting 2.SWF into multiple PNG files, etc etc.

Anyone please tell me what I've done wrong?

I have some problem, but I change the frame rate to 1, and in "stop exporting" setting, change to when last frame is reached, then change to 1 seconds, also need to select multiple swf file.

1. Download ORB
2. Change name of the file from ****.orb to ****.zip
3. Unpack the file
4. Shit + Right click the folder with the *.gau files
5. Select 'open command line here"
6. rename *.gau *.swf
7. Select the last file.
8. Shit + Home to select all files from the last to the first
9. Right click the first file and select rename
10. Rename it as (10000)
11. Files are now numbered as (10000).swf, (10001).swf, (10002).swf, etc.
12. Open SWF Renderer (I know, it is a paid software, but no other program does this)
13. Set frame rate to 1, export format to PNG Encoder
14. Click "Add to render queue SWF Files"
15. Select all .swf files on folder (sometimes the program will crash if you select over 600 at a time).
16. Click "start render"
17. After finished, open Image2PDF
18. Click "Add directory" or "Add files"
19. Select the .png files created with SWF Renderer.
20. Click "Make PDF"
21. Open Abby FineReader
22. Open the PDF you just created with Image2PDF
23. After OCR, export it as PDF (not PDF/A)
24. Now open FoxitReader
25. Make your own Table of Contents for the PDF. Save it.
26. Now open Adobe Reader XI
27. Open the PDF you just created with Abby FineReader
28. Click "Save As..." and save it. Do this because Adobe Reader XI makes PDF faster.
29. ????
30. PROFIT!!!!